/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
}

.header .user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header .user-info span {
    font-size: 14px;
}

/* 导航栏样式 */
.nav {
    background: #f8f9fa;
    padding: 15px 30px;
    border-bottom: 1px solid #e9ecef;
}

.nav a {
    color: #495057;
    text-decoration: none;
    margin-right: 20px;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav a:hover, .nav a.active {
    background: #007bff;
    color: white;
}

/* 内容区域样式 */
.content {
    padding: 30px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #495057;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ced4da;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    margin-right: 10px;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #1e7e34;
    transform: translateY(-2px);
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-warning:hover {
    background: #e0a800;
    transform: translateY(-2px);
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
    transform: translateY(-2px);
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #495057;
}

.table tbody tr:hover {
    background: #f8f9fa;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.card-header {
    background: #f8f9fa;
    padding: 15px 20px;
    border-bottom: 1px solid #dee2e6;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

/* 登录页面样式 */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h2 {
    color: #495057;
    font-size: 28px;
    margin-bottom: 10px;
}

.login-header p {
    color: #6c757d;
    font-size: 14px;
}

/* 搜索表单样式 */
.search-form {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.search-form .form-row {
    display: flex;
    gap: 15px;
    align-items: end;
}

.search-form .form-group {
    flex: 1;
    margin-bottom: 0;
}

/* 统计卡片样式 */
.stats-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 20px;
}

.stats-card h3 {
    font-size: 36px;
    margin-bottom: 5px;
}

.stats-card p {
    font-size: 14px;
    opacity: 0.9;
}

/* 错误提示样式 */
.alert {
    padding: 12px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 0;
    }
    
    .header {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .nav {
        padding: 10px 15px;
    }
    
    .content {
        padding: 20px 15px;
    }
    
    .search-form .form-row {
        flex-direction: column;
    }
    
    .table {
        font-size: 12px;
    }
    
    .table th,
    .table td {
        padding: 8px 10px;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 12px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}